transform.c File Reference

This file contains routines which perform (affine?) transformations from one coordinate system into another. More...

#include <stdio.h>
#include <math.h>
#include <grass/libtrans.h>

Include dependency graph for transform.c:

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Functions
int	compute_transformation_coef (double ax[], double ay[], double bx[], double by[], int *use, int n)
int	transform_a_into_b (double ax, double ay, double *bx, double *by)
int	transform_b_into_a (double bx, double by, double *ax, double *ay)
int	residuals_a_predicts_b (double ax[], double ay[], double bx[], double by[], int use[], int n, double residuals[], double *rms)
int	residuals_b_predicts_a (double ax[], double ay[], double bx[], double by[], int use[], int n, double residuals[], double *rms)
int	print_transform_matrix (void)
	Prints matrix to stdout in human readable format. More...

Detailed Description

This file contains routines which perform (affine?) transformations from one coordinate system into another.

The second system may be translated, stretched, and rotated relative to the first. The input system is system a and the output system is b.

This program is free software under the GNU General Public License (>=v2). Read the file COPYING that comes with GRASS for details.

Author

GRASS GIS Development Team

Date

1987-2007

Definition in file transform.c.

Function Documentation

int compute_transformation_coef	(	double	ax[],
		double	ay[],
		double	bx[],
		double	by[],
		int *	use,
		int	n
	)

Definition at line 90 of file transform.c.

References count, inverse(), m_mult(), and n.

int print_transform_matrix

(

void

)

Prints matrix to stdout in human readable format.

Returns

int 1

Definition at line 231 of file transform.c.

int residuals_a_predicts_b	(	double	ax[],
		double	ay[],
		double	bx[],
		double	by[],
		int	use[],
		int	n,
		double	residuals[],
		double *	rms
	)

Definition at line 205 of file transform.c.

int residuals_b_predicts_a	(	double	ax[],
		double	ay[],
		double	bx[],
		double	by[],
		int	use[],
		int	n,
		double	residuals[],
		double *	rms
	)

Definition at line 214 of file transform.c.

int transform_a_into_b	(	double	ax,
		double	ay,
		double *	bx,
		double *	by
	)

Definition at line 174 of file transform.c.

int transform_b_into_a	(	double	bx,
		double	by,
		double *	ax,
		double *	ay
	)

Definition at line 183 of file transform.c.